感谢诸位大虾的参与与解答,如有哪位知道怎样送分,还望告诉在下,我将为你们加分,此题已解决,代码见后面,我现在一个新难题,要在一个窗体中同时显示多副图像,且还不是一次打开的,一次只能打开一个,最后将所有图像以256像素或其他格式保存到一个文件。我觉得保存应该不难,关键是把多个不一块打开且数目不确定的文件同时显示,我至今没有什么好办法,我现在可以在不同的位置显示图像,但每当显示下一个图像时,前一个将消失,一次只能显示一个,尽管不会出现位置重复,还望诸位大虾参与,并多多指教! 以下是我的关键代码:/************************************************************************* * * LoadBMP() * * Parameter: * * CPalette* pPal - pointer to CPalette containing DIB's palette * * Return Value: * * HGLOBAL - handle to global memory with a DIB spec * in it followed by the DIB bits * * Description: * * This function opens a BMP file, and creates a palette from * a DIB by allocating memory for the logical palette, * reading and storing the colors from the DIB's color table * into the logical palette, creating a palette from this * logical palette,and then returning the handle of global memory, * and *pPal specify the palette's handle,This allows the DIB to * be displayed using the best possible colors (important for DIBs * with 256 or more colors). * ************************************************************************/HGLOBAL CBitMapOpView::LoadBMP( CPalette *pPal ) {
HANDLE hFile; int n; n=Bmpname.Replace("\\", "\\\\");
// Open the existing file.
hFile = CreateFile( Bmpname, // open the BitMap file GENERIC_READ, 0, // not share NULL, // no security OPEN_EXISTING, // existing file only FILE_ATTRIBUTE_NORMAL, // normal file NULL); // no attr. template //fail to open file if (hFile == INVALID_HANDLE_VALUE) { return NULL; }
BITMAPFILEHEADER bmfHeader; DWORD nFileLen,dwBytesRead; nFileLen = GetFileSize (hFile, NULL) ; //get the length of the file // Read file header if(!ReadFile(hFile, (LPSTR)&bmfHeader, sizeof(bmfHeader), &dwBytesRead, NULL) || dwBytesRead != sizeof(bmfHeader)) return NULL; // File type should be 'BM' if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B')) return NULL; HGLOBAL hDIB = ::GlobalAlloc(GMEM_FIXED, nFileLen); if (hDIB == 0) return NULL; // Read the remainder of the bitmap file. if(!ReadFile(hFile, (LPSTR)hDIB, nFileLen - sizeof(BITMAPFILEHEADER), &dwBytesRead, NULL) || dwBytesRead != nFileLen - sizeof(BITMAPFILEHEADER)) { ::GlobalFree(hDIB); return NULL; } BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ; //nColors is the factual color num int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed : 1 << bmInfo.bmiHeader.biBitCount; // Create the palette UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors); LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize]; pLP->palVersion = 0x300; //version number pLP->palNumEntries = nColors;
//create color matrix for( int i=0; i < nColors; i++) { pLP->palPalEntry[i].peRed = bmInfo.bmiColors[i].rgbRed; pLP->palPalEntry[i].peGreen = bmInfo.bmiColors[i].rgbGreen; pLP->palPalEntry[i].peBlue = bmInfo.bmiColors[i].rgbBlue; pLP->palPalEntry[i].peFlags = 0; } pPal->CreatePalette( pLP ); delete[] pLP; CloseHandle(hFile);// Close the files. return hDIB; } /************************************************************************* * * DrawDIB() * * Parameters: * * CDC *pDC - DC to do output to * * HGLOBAL hDIB - handle to global memory with a DIB spec * in it followed by the DIB bits * * CPalette* pPal - pointer to CPalette containing DIB's palette * * Return Value: * * BOOL - TRUE if DIB was drawn, FALSE otherwise * * Description: * Painting routine for a DIB. Calls StretchDIBits() or * SetDIBitsToDevice() to paint the DIB. The DIB is * output to the specified DC, at the coordinates given * in lpDCRect. The area of the DIB to be output is * given by lpDIBRect. * ************************************************************************/ bool CBitMapOpView::DrawDIB( CDC* pDC, HGLOBAL hDIB, CPalette *pPal ) { LPVOID lpDIBBits; // Pointer to DIB bits bool bsuccess = false; //Check hDIB,if hDIB is null,exit the function if(hDIB == NULL) return bsuccess; BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
//nColors is the factual color num int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed : 1 << bmInfo.bmiHeader.biBitCount;
//16 bit or 24 bit or 32 bit clearly color if( bmInfo.bmiHeader.biBitCount > 8 ) lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors + bmInfo.bmiHeader.biClrUsed) + ((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0));
//Other color else lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
// select the palette into a device context and realize it if( pPal && (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) ) { pDC->SelectPalette(pPal, FALSE); pDC->RealizePalette(); } //draw bmp
GetDC
LoadImage
CreateCompableDC
等等api~~~~~~~~~这方面的教程网上很多阿~~
HDC hdc, memdc;
hdc = ::GetDC(....);
memdc = ::CreateCompatibleDC(hdc);
HBITMAP hOldbitmap = (HBITMAP)::SelectObject(memdc, bitmap);
::Bitblt(.......);
::SelectObject(memdc, hOldbitmap);
DeleteDC(memdc);
ReleaseDC(....);
DeleteObject(bitmap);
WWW.LWSOFT.COM 上的tank就是这么做的。
如果你可以熟练的读取bmp的各种信息,起码先做到能把图像点阵的数据读出来,然后我可以给你讲怎么把它显示出来。
不难,先自己查一下资料。学会了就给我发mail: [email protected] ,我再告诉你下一不做什么。
以下是我的关键代码:/*************************************************************************
*
* LoadBMP()
*
* Parameter:
*
* CPalette* pPal - pointer to CPalette containing DIB's palette
*
* Return Value:
*
* HGLOBAL - handle to global memory with a DIB spec
* in it followed by the DIB bits
*
* Description:
*
* This function opens a BMP file, and creates a palette from
* a DIB by allocating memory for the logical palette,
* reading and storing the colors from the DIB's color table
* into the logical palette, creating a palette from this
* logical palette,and then returning the handle of global memory,
* and *pPal specify the palette's handle,This allows the DIB to
* be displayed using the best possible colors (important for DIBs
* with 256 or more colors).
*
************************************************************************/HGLOBAL CBitMapOpView::LoadBMP( CPalette *pPal )
{
HANDLE hFile;
int n;
n=Bmpname.Replace("\\", "\\\\");
// Open the existing file.
hFile = CreateFile( Bmpname, // open the BitMap file
GENERIC_READ,
0, // not share
NULL, // no security
OPEN_EXISTING, // existing file only
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template //fail to open file
if (hFile == INVALID_HANDLE_VALUE)
{
return NULL;
}
BITMAPFILEHEADER bmfHeader;
DWORD nFileLen,dwBytesRead;
nFileLen = GetFileSize (hFile, NULL) ; //get the length of the file
// Read file header
if(!ReadFile(hFile, (LPSTR)&bmfHeader, sizeof(bmfHeader), &dwBytesRead, NULL) ||
dwBytesRead != sizeof(bmfHeader))
return NULL;
// File type should be 'BM'
if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B'))
return NULL; HGLOBAL hDIB = ::GlobalAlloc(GMEM_FIXED, nFileLen);
if (hDIB == 0)
return NULL; // Read the remainder of the bitmap file.
if(!ReadFile(hFile, (LPSTR)hDIB, nFileLen - sizeof(BITMAPFILEHEADER), &dwBytesRead, NULL) ||
dwBytesRead != nFileLen - sizeof(BITMAPFILEHEADER))
{
::GlobalFree(hDIB);
return NULL;
} BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ; //nColors is the factual color num
int nColors = bmInfo.bmiHeader.biClrUsed ?
bmInfo.bmiHeader.biClrUsed : 1 << bmInfo.bmiHeader.biBitCount;
// Create the palette UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors);
LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize]; pLP->palVersion = 0x300; //version number
pLP->palNumEntries = nColors;
//create color matrix
for( int i=0; i < nColors; i++)
{
pLP->palPalEntry[i].peRed = bmInfo.bmiColors[i].rgbRed;
pLP->palPalEntry[i].peGreen = bmInfo.bmiColors[i].rgbGreen;
pLP->palPalEntry[i].peBlue = bmInfo.bmiColors[i].rgbBlue;
pLP->palPalEntry[i].peFlags = 0;
} pPal->CreatePalette( pLP );
delete[] pLP;
CloseHandle(hFile);// Close the files.
return hDIB;
}
/*************************************************************************
*
* DrawDIB()
*
* Parameters:
*
* CDC *pDC - DC to do output to
*
* HGLOBAL hDIB - handle to global memory with a DIB spec
* in it followed by the DIB bits
*
* CPalette* pPal - pointer to CPalette containing DIB's palette
*
* Return Value:
*
* BOOL - TRUE if DIB was drawn, FALSE otherwise
*
* Description:
* Painting routine for a DIB. Calls StretchDIBits() or
* SetDIBitsToDevice() to paint the DIB. The DIB is
* output to the specified DC, at the coordinates given
* in lpDCRect. The area of the DIB to be output is
* given by lpDIBRect.
*
************************************************************************/ bool CBitMapOpView::DrawDIB( CDC* pDC, HGLOBAL hDIB, CPalette *pPal )
{
LPVOID lpDIBBits; // Pointer to DIB bits
bool bsuccess = false; //Check hDIB,if hDIB is null,exit the function
if(hDIB == NULL)
return bsuccess; BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
//nColors is the factual color num
int nColors = bmInfo.bmiHeader.biClrUsed ?
bmInfo.bmiHeader.biClrUsed : 1 << bmInfo.bmiHeader.biBitCount;
//16 bit or 24 bit or 32 bit clearly color
if( bmInfo.bmiHeader.biBitCount > 8 )
lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors +
bmInfo.bmiHeader.biClrUsed) +
((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0));
//Other color
else
lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
// select the palette into a device context and realize it
if( pPal && (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) )
{
pDC->SelectPalette(pPal, FALSE);
pDC->RealizePalette();
} //draw bmp
::SetDIBitsToDevice(pDC->m_hDC, // hDC
width, // DestX
height, // DestY
bmInfo.bmiHeader.biWidth, // nDestWidth
bmInfo.bmiHeader.biHeight, // nDestHeight
0, // SrcX
0, // SrcY
0, // nStartScan
bmInfo.bmiHeader.biHeight, // nNumScans
lpDIBBits, // lpBits
(LPBITMAPINFO)hDIB, // lpBitsInfo
DIB_RGB_COLORS); // wUsage width = width + bmInfo.bmiHeader.biWidth;
//height = height + bmInfo.bmiHeader.biHeight;
bsuccess = true;
return bsuccess;
}